Buggy code:
public class CompilerRun implements IAjcRun { static final String [ ] RA_String = new String [ 0 ] ; static final String [ ] JAR_SUFFIXES = new String [ ] { ".jar" , ".zip" } ; static final String [ ] SOURCE_SUFFIXES = ( ( String [ ] ) ( FileUtil . SOURCE_SUFFIXES . toArray ( new String [ 0 ] ) ) ) ; CompilerRun . Spec spec ; Sandbox sandbox ; final List arguments ; final List injars ; private CompilerRun ( CompilerRun . Spec spec ) { } public boolean setupAjcRun ( Sandbox sandbox , Validator validator ) { } public boolean run ( IRunStatus status ) { } public String toString ( ) { } public static class Spec extends AbstractRunSpec { public static final String XMLNAME = "compile" ; static final String SEEK_PREFIX = "-seek:" ; static final String SEEK_MESSAGE_PREFIX = "found:<seq2seq4repair_space>" ; private static final String [ ] INVALID_OPTIONS = new String [ ] { "-workingdir" , "-argfile" , "-sourceroot" , "-outjar" } ; private static final String [ ] INVALID_ECLIPSE_OPTIONS = new String [ ] { "-lenient" , "-strict" , "-usejavac" , "-preprocess" , "-XOcodeSize" , "-XSerializable" , "-XaddSafePrefix" , "-XserializableAspects" , "-XtargetNearSource" } ; private static final String [ ] VALID_OPTIONS = new String [ ] { CompilerRun . Spec . SEEK_PREFIX , "-usejavac" , "-preprocess" , "-Xlint" , "-lenient" , "-strict" , "-source14" , "-verbose" , "-emacssym" , "-ajc" , "-eclipse" , "-ignoreWarnings" , "!usejavac" , "!preprocess" , "!Xlint" , "!lenient" , "!strict" , "!source14" , "!verbose" , "!emacssym" , "!ajc" , "!eclipse" , "^usejavac" , "^preprocess" , "^Xlint" , "^lenient" , "^strict" , "^source14" , "^verbose" , "^emacssym" , "^ajc" , "^eclipse" } ; public static final String DEFAULT_COMPILER = ReflectionFactory . ECLIPSE ; private static final XMLNames NAMES = new XMLNames ( XMLNames . DEFAULT , "title" , null , null , null , "files" , null , false , false , true ) ; protected String compiler ; protected CompilerRun . Spec . TestSetup testSetup ; protected String [ ] argfiles = new String [ 0 ] ; protected String [ ] aspectpath = new String [ 0 ] ; protected String [ ] classpath = new String [ 0 ] ; protected String testSrcDirOffset ; public Spec ( ) { } public void setCompiler ( String compilerName ) { } public void setTestSrcDirOffset ( String s ) { } public void addDirChanges ( DirChanges . Spec spec ) { } protected String getPrintName ( ) { } public String toLongString ( ) { } public String toString ( ) { } public void setFiles ( String paths ) { } public void setClasspath ( String files ) { } public void setAspectpath ( String files ) { } public void setArgfiles ( String files ) { } public String [ ] getArgfilesArray ( ) { } protected boolean doAdoptParentValues ( RT parentRuntime , IMessageHandler handler ) { } private String getShortCompilerName ( ) { } public IRunIterator makeRunIterator ( Sandbox sandbox , Validator validator ) { } protected CompilerRun . Spec . TestSetup setupArgs ( IMessageHandler handler ) { } private boolean haveJavac ( ) { } protected boolean testFlag ( String arg , CompilerRun . Spec . TestSetup result ) { } protected int indexOf ( String global , ArrayList argList ) { } public void writeXml ( XMLWriter out ) { if ( ( ( CompilerRun . Spec . DEFAULT_COMPILER . equals ( compiler ) ) && ( LangUtil . isEmpty ( testSrcDirOffset ) ) ) && ( LangUtil . isEmpty ( argfiles ) ) ) { super . writeXml ( out ) ; return ; } String attr = "" ; out . startElement ( xmlElementName , false ) ; if ( ! ( CompilerRun . Spec . DEFAULT_COMPILER . equals ( compiler ) ) ) { out . printAttribute ( "compiler" , compiler ) ; } if ( ! ( LangUtil . isEmpty ( testSrcDirOffset ) ) ) { out . printAttribute ( "dir" , testSrcDirOffset ) ; } if ( ! ( LangUtil . isEmpty ( argfiles ) ) ) { <START_BUG> out . printAttribute ( "argfiles" , out . flattenFiles ( argfiles ) ) ; <END_BUG> } super . writeAttributes ( out ) ; out . endAttributes ( ) ; if ( ! ( LangUtil . isEmpty ( dirChanges ) ) ) { DirChanges . Spec . writeXml ( out , dirChanges ) ; } List messages = getMessages ( ) ; if ( ! ( LangUtil . isEmpty ( messages ) ) ) { SoftMessage . writeXml ( out , messages ) ; } out . endElement ( xmlElementName ) ; } class TestSetup { String compilerName ; boolean ignoreWarningsSet ; boolean ignoreWarnings ; boolean result ; String failureReason ; String seek ; ArrayList commandOptions ; public String toString ( ) { } } } }

Fix:
out . printAttribute ( "argfiles" , XMLWriter . flattenFiles ( argfiles ) ) ;